Gemini 3.1 Pro Preview vs Grok 4.5
Price, context and benchmark scores side by side — every number from the live model catalogue.
| Gemini 3.1 Pro Previewgoogle | Grok 4.5x-ai | |
|---|---|---|
| Input / 1M tokens | $2.00 | $2.00 |
| Output / 1M tokens | $12.00 | $6.00 |
| 1M in + 300K out | $5.60 | $3.80 |
| Context window | 1.0M | 500K |
| Intelligence index | 46.5 | 53.8 |
| Coding index | 68.8 | 72.4 |
| Agentic index | 21.4 | 45.7 |
| Cheapest provider | xAI | |
| Providers serving it | 2 | 1 |
| Weights | Closed | Closed |
| Image input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
| Released | Feb 19, 2026 | Jul 8, 2026 |
Which one to pick
Pick Gemini 3.1 Pro Preview if…
- You need the bigger context window (1.0M).
- You want provider redundancy: 2 providers serve it.
Pick Grok 4.5 if…
- You want the higher general-intelligence score (53.8).
- Code quality is the priority — it leads on the coding index (72.4).
- You are running agent loops — higher agentic index (45.7).
- Token cost matters: $6.00 per 1M output vs $12.00.
FAQ
Is Gemini 3.1 Pro Preview better than Grok 4.5?
Grok 4.5 scores higher on general intelligence (46.5 vs 53.8), while Grok 4.5 is 2.0× cheaper per output token ($6.00 vs $12.00). For code, Grok 4.5 leads (72.4 coding index). Gemini 3.1 Pro Preview takes the larger context at 1.0M.
Which is cheaper, Gemini 3.1 Pro Preview or Grok 4.5?
Grok 4.5, at $6.00 per 1M output tokens versus $12.00. On a 1M input + 300K output workload that is $3.80 against $5.60.
Can I self-host Gemini 3.1 Pro Preview or Grok 4.5?
Gemini 3.1 Pro Preview: closed weights, API only. Grok 4.5: closed weights, API only.